全固态太阳光泵浦激光器热效应分析

太阳光泵浦激光器是将太阳光直接转化为激光的装置，具有能量转换环节少、效率高、结构简单可靠、性能稳定以及无污染等优点。对应用于空间环境（4 K）的全固态太阳光泵浦激光器进行了建模，并对泵浦太阳光收集阶段进行了热效应分析。先后考虑两种安装底座和四种太阳光线偏转情况，运用ANSYS Workbench@热分析软件分别进行了稳态热分析。针对第一种情况得到的可行性验证，提出了下一步的改进优化意见，并初步设想进行实际模型搭建和测试。针对第二种不可行情况，提出了几种可能的改进措施，并对未来的工作进行了展望。该研究为太阳光泵浦激光器在空间环境中的实际应用提供了一种全新的、采用全固态传导冷却方式温控系统的可行方案，为未来空间太阳光泵浦激光器能够得到实际应用提供了研究资料。     

格罗斯科夫斯基（Groszkowski Janusz，1898-1984）波兰物理学家（Physicist，Poland）

格罗斯科夫斯基是波兰无线电电子学界的元老，培养了波兰几代电子学专家。他提出了一种分析非线性电振荡的方法，也是研究分米波的专家，并制成世界上第一台磁控管微波发生器，工作在600MHz。德国占领波兰时期，他破解了V2火箭的无线电制导机制，经由地下工作者把这一情报送到英国，为反法西斯战争做出了贡献。     

分子碰撞振动激发的一种计算方法

研究原子和双原子分子碰撞的振动激发过程，需要求争一组振动耦合微分方程组，给出了此方程组的一种数值求解方法，推导了ＩＯＳ近似下的振动激发截面公式，将方程化简为无量纲形式，然后给出了解方程的方法，最后给出应用这种方法计算的一个例子，并与实验结果进行了比较。     

新型虚阴极振荡器的研究

 采用小信号理论，在考虑到透射、反射束电子不同作用下，分析了虚阴极振荡器产生微波的机制，获得了计算微波主频的方法，讨论了增强束波作用效率的方法，并提出一种新型结构的虚阴极振荡器。该振荡器的阳极后放置了一个谐振腔，谐振腔长度很小，虚阴极不能在其中形成，谐振腔受到反射电子束激励并建立强场，场对入射电子进行调制，同时采用同轴结构引出微波。利用2.5D PIC 程序对新型的结构进行了数值模拟，验证了理论分析的正确性。在入射电子束电子能量为520keV和电子束流12.5kA的条件下，获得微波平均功率为1GW，频率为3.66GHz，平均束波转换效率为15.3%。     

一种改进型C波段磁绝缘线振荡器的数值模拟研究

 提出了一种改进型C波段磁绝缘线振荡器，并对其进行了优化设计。首先根据磁绝缘原理对慢波结构进行了理论分析，并选择了磁绝缘线振荡器阴极半径和主慢波结构的基本参数，然后用2.5维全电磁PIC方法研究了输出功率与其它参数之间的关系。模拟表明，优化结构可以在输入约21GW电功率（工作电压约500kV）的条件下，得到频率3.91GHz、平均功率2.71GW的微波输出，其饱和时间为10ns，平均效率为12.9%。     

榕树网络的互连矩阵与模拟研究

本文导出了榕树网络的互连矩阵，并进行了模拟计算，结果与实验吻合。从而为理论上研究榕树网络的互连函数提供了一种有效的分析方法。     

X波段五腔渡越管振荡器的理论与实验研究

提出了一种新结构的X波段五腔渡越管振荡器，进行了理论和实验研究。根据场分布进行了一维非线性分析，结果表明该结构可以产生高功率微波，并判断了工作模式，为TM01模的3π/5模。采用粒子模拟验证了一维非线性分析的结论，并优化设计出五腔渡越管振荡器,优化结果为:输出功率约1 GW， 工作频率9.3 GHz，束波转换效率约22%。实验中，通过参数调节，得到频率约9.25 GHz，峰值功率约780 MW，脉宽（半高宽）21 ns的输出微波，束波转换效率约为16%。实验结果与模拟结果基本符合。     

ENSO事件随机动力学模型的渐近分析

利用边界层型函数，研究了ENSO事件随机动力学的某一模型，给出了这一问题的n阶渐 近展开式，将相关结论应用于特殊的ENSO事件，并得到了零阶渐近解，为分析ENSO事件的变 化状态提供了依据. 关键词： ENSO事件 边界层型函数 渐近展开式     

塑料脱模剂一组分的光谱分析

柱层析色谱分离性能优良的新型塑料脱模剂，纯化后得一主要未知组分。用元素分析、红外光谱、核磁共振氢谱研究其结构特征，对其盐酸酸化前后红外光谱吸收峰及核磁带进行了归属分析并确定结构。结果表明，该组分为一表面活性剂N，N-二羟乙基十二烷基胺。这为新型脱模剂的产品开发提供了依据。     

讨论课中引入演示实验的尝试

大学物理教学改革使得讨论课越来越重要，为使讨论课更有成效，本提出了将物理演示实验引进大学物理讨论课课堂的设想，并介绍了将这一设想付诸实践的情况。     

A novel 3D geometric object filtering function for application in indoor area with terrestrial laser scanning data

In measurement technology, besides the photogrammetric method, terrestrial laser scanning and modeling technology are densely used in architectural documentation and cultural heritage studies. In the perception of engineering perspective, these two methods are independent of each other. However, these two methods can be combined with each other in the essential parts of architectural documentation and cultural heritage studies. While one is implementing these applications, the working procedure is so significant that if the amount of data increases, time consumption reaches higher levels. These two methods are compulsorily optimized for working in a collaborative way, especially in the large-scale studies. This necessity leads to the application of two types of integration. One of them is the hardware integration, and the other one is the data integration. In this study, a new data integration model is suggested for the operating processes in architectural documentation and cultural heritage studies, with the terrestrial laser scanning that uses new data production methods of photogrammetry. The mathematical model and algorithm in the presented integration model is programmed in MatLAB 7.0 and is tested with the original data set. At the end of the study, results are discussed and comments are made so that the advantages and disadvantages of the functional model of the algorithm are presented. The functional model is explained, benefiting from the object-oriented programming languages in the MS Windows system.     

Dawson–Furnstahl计算方案与Dirac空穴理论的联系

在相对论无规位相近似中,有两种顾及负能态贡献的方法.一种是由Dawson和Furnstahl(DF)提出的计算方案.他们假定Dirac海是空的.另外一种就是Dirac空穴理论,它认为负能海的全充满的.这两种方法在顾及负能态贡献上看似完全对立.文章中考察了这两种方法的关系,并给出了DF方法的适用范围.     

哈特曼测量大气相干长度研究

研究了利用哈特曼波前传感器测量大气相干长度的两种方法:一种是测量两个子孔径恒星光波到达角起伏方差的差分像运动法;另一种是测量恒星波前分布,通过波前分布的剩余方差推算得到大气相干长度。试验测量结果表明,两种方法得到的测量结果基本一致,得到了大气相干长度的可靠数据,两种方法得到了相互验证,实现了在应用哈特曼波前传感器测量大气波前分布时,同时得到当前的大气信息,对分析哈特曼波前传感器的测量结果有参考意义。     

Synchronization in a unified fractional-order chaotic system

In this paper, the synchronization in a unified fractional-order chaotic system is investigated by two methods. One is the frequency-domain method that is analysed by using the Laplace transform theory. The other is the time-domain method that is analysed by using the Lyapunov stability theory. Finally, the numerical simulations are used to illustrate the effectiveness of the proposed synchronization methods.     

红外隐身技术的应用及发展趋势

从斯忒藩-波尔兹曼定律出发,阐述了红外隐身的基本原理,分析得出实现红外隐身的几种方法。介绍了红外隐身材料的作用机理,指出了目前这些材料存在的主要问题,然后描述了红外隐身技术在军事上的具体应用和研究进展,总结了红外隐身技术的未来发展趋势。最后,指出今后的研究将主要在以下两方面展开：一是寻求全波段多隐身技术的兼容;二是对现有方法进行改进并探索新的红外隐身方法。     

Application of AFF and HPM to the systems of strongly nonlinear oscillation

This study is concerned with two well-known systems of nonlinear oscillators. One of them is a system consists of a mass grounded two springs which one of those springs is linear and the other is nonlinear, and the other one is dealt with nonlinear large amplitude free vibrations of a slender cantilever beam with a rotationally flexible root and carrying a lumped mass at an intermediate position along its span. The main objective was to obtain highly accurate analytical solutions for free vibration of conservative oscillators with inertia and static type cubic nonlinearities. Two methods are studied to analyze the dynamic system behavior. One method makes use of a set of Amplitude–Frequency Formulation (AFF) and the other method applies Homotopy Perturbation Method (HPM). Taking advantage of some simple mathematical operations on these methods, we can obtain their natural frequencies. The computed results agree with those analytical and numerical results given in the literatures. The results indicate that the present analysis is accurate, and provide us a unified and systematic procedure which is simple and more straightforward than the other similar methods.     

非共轴激光雷达几何因子分析与测量

介绍了非共轴激光雷达几何因子的物理意义,分别通过理论分析和试验测量给出了求解几何因子的方法。结合自行研制的CSY-1便携式能见度激光雷达,将两种方法得到的几何因子进行对比,讨论了系统参数对几何因子的影响,从而实现了对激光雷达系统优化设计的可能性。     

On some aspects of the definition of scattering states in quantum field theory

The problem of extending quantum-mechanical formal scattering theory to a more general class of models that also includes quantum field theories is discussed, with the aim of clarifying certain aspects of the definition of scattering states. As the strong limit is not suitable for the definition of scattering states in quantum field theory, some other limiting procedure is needed. Two possibilities are considered, the abelian limit and adiabatic switching. Formulas for the scattering states based on both methods are discussed, and it is found that generally there are significant differences between the two approaches. As an illustration of the applications and the features of these formulas, S-matrix elements and energy corrections in two quantum field theoretical models are calculated using (generalized) old-fashioned perturbation theory. The two methods are found to give equivalent results.     

Acoustic Monitoring of the Sea Medium Variability: Experimental Testing of New Methods

Two new methods of acoustic monitoring of the sea medium are tested in a shelf region. One of the methods is the difference-pulse technique in which the variability of the medium is characterized by the difference in the energies of the sequences of arrivals of two multiray signals. The other method is the self-sustained oscillator technique in which the information on the changes that occur in the water temperature, the velocity of currents, and other parameters of the medium is obtained from the frequency deviation of a self-sustained oscillator that has a feedback loop closed through the underwater sound channel.     

Aspects of highway design and traffic management

This paper is concerned with the part that the design of the highway and the management of the traffic on it can play in noise problems. The noise characteristics of individual vehicles and of traffic are summarized in the Appendixes. Attention is confined to vehicles with conventional petrol and diesel engines and to noise outside the vehicles. Alternative methods of reducing traffic noise are compared and their effects on other aspects of the highway and the traffic are considered. The conclusion is drawn that there are two alternative approaches to noise reduction. One is to reduce traffic flow and the other is to make use of noise barriers and environmental design. The relative importance of these two approaches depends on the type of road under consideration.